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Definition

A callus is an abnormal thickening of the top layer of skin, which is composed of the natural protein, keratin. Calluses can form on body surface areas that are repeatedly exposed to friction or pressure. They are usually painless or only mildly painful.

A corn is a small, thickened area of skin that forms on the toes. Corns put pressure on the underlying skin against the bone, and they are usually very painful.